This paper explains how Poisson regression can be used in studies in which the dependent variable describes the number of occurrences of some rare event such as suicide. After pointing out why ordinary linear regression is inappropriate for treating dependent variables of this sort, we go on to present the basic Poisson regression model and show how it fits in the broad class of generalized linear models. Then we turn to discussing a major problem of Poisson regression known as overdispersion and suggest possible solutions, including the correction of standard errors and negative binomial regression. The paper ends with a detailed empirical example, drawn from our own research on suicide. KEYWORDS Deviant behavior, Generalized linear models, Poisson regression, Rare events, Research methods, Statistical analysis, SuicideIn social research, we often encounter dependent variables that describe the frequency of occurrence of events of various kinds. Students of deviant behavior, for example, look at whether media reporting of celebrity suicides leads to an increase in the number of self-destruction; demographers study the impact of environmental hazards on the number of birth defects; and sociologists of science examine the factors that influence the frequency with which publications are cited by fellow researchers. In cases like these, scholars frequently rely on ordinary linear regression to analyze their data.
In this study, we test two explanations of why Protestants generally are more prone to suicide than Catholics. one theory stresses the importance of social support, while the other emphasizes the role of culture. A case-control study with 182 suicidal and 610 non-suicidal individuals was conducted. Denominational differences do not disappear after controlling for church attendance. Deeper involvement in the church community decreases suicide risk for Catholics, but increases it for Protestants. The relationship between education and suicide, while curvilinear for both religions, has a U-shaped form for Protestants, but an inverted U-shaped form for Catholics. Our findings corroborate the cultural explanation and demonstrate that the impact of integration on suicide can only be understood by taking cultural characteristics into account.
Objective: To examine the effect of religion on negative attitudes and beliefs about suicide. Methods: We use data from a large nationwide survey conducted in Hungary covering more than 3000 individuals. Suicide-related stigmas are captured with three Likert-type measures that we combine into an overall indicator. Religion is measured by denomination (Catholic vs. Protestant) and church attendance (at least weekly vs. never or less than weekly). We employ logistic regression and the SPSS statistical software. Results: People attending religious services frequently have greater odds of stigmatizing self-killing than those reporting no or infrequent attendance. Compared to Protestants, Catholics are significantly less condemning of suicide. The two measures of religion also work in tandem, with denomination modifying the impact of church attendance. In particular, while church attendance strongly increases the odds of negative attitudes among Catholics, it has practically no effect among Protestants. Discussion and Conclusions: The results presented are in keeping with our expectations and suggest that a social climate that stigmatizes suicide without providing for people a strong community network that pressures individuals toward conforming to fundamental moral principles can be especially harmful for mental health.
Aiming to perform the first sociological survey of Hungarian twins, our main question was whether being a twin has positive consequences on one's life. Adult twins completed our questionnaire at three Hungarian summer twin festivals, in hospitals during medical twin studies, and on some websites online. Data represent 140 twin pairs (mean age: 38.2 ± 14.6 years). We employed some indices for measuring the resource nature of twinship. Three main types of benefits were distinguished: profit of attraction, as 'material capital'; the easier obtainability of cultural goods when twins take part in it, as 'cultural capital'; and positive aspects of an a priori existing dyadic relation, as 'relational capital'. We were interested in the difference among types of twins regarding advantages. We paid special attention to the five groups of twins derived from gender and zygosity (i.e., monozygotic females, monozygotic males, dizygotic females, dizygotic males, opposite-sex pairs). Our analysis showed that Hungarian twins involved in our research basically enjoy their twinship; during their lives they used and still make use of different benefits given by it. In our twin samples, women had more advantages from being a twin than men. Significant differences could be observed on all indicators between monozygotic and dizygotic twins.
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